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不是看起来像睡着了就一定在睡觉”
Sleepy look does not necessarily mean falling asleep.

Looking like having fallen asleep isn't surely sleeping.

睡着了 [简明汉英词典]
fell asleep

不是看起来像睡觉就一定在睡觉

Looking like asleep isn't surely sleeping.

直接写“外观/外貌有时会欺骗人。”就好。因为上下文会说“看起来好象没有斗志了”，这里再说“睡觉”就会有些累赘。

Appearance can be deceiving.

可以比喻为火山吗？
being dominant doesn't mean it won't ever erupt

直接翻译：
appeared to be sleeping is just that - appeared to be.
看起来像睡着了 只不过是看起来而已。

I hope this works.

Not looks like sleeping is sleeping anyway.

不是看起来像睡着了就一定在睡觉

Being sleeping-like does not surely mean sleeping.